In several respects the flora of the Tetons is unique. The high mountains have constituted a plant-migration barrier which many forms could not cross; hence the range limit of a number of species is found here. Representatives from north, south, east, and west are in the region, this being the limit, in many instances, of their distribution. There are a number of plants typical of the central Rockies and a few known only to this range. Four life zones are recognized within the park, all occurring within a distance of less than 15 miles. [Illustration: _A part of the Jackson Hole Elk herd._] The flowering period begins in the park as soon as the ridges and flats are free of snow in May, and it continues until about August 15 in the Arctic-Alpine Zone. Hence, plants of at least one zone and usually of several may be seen blooming at any time in the spring or summer. The evergreen trees (of which the lodgepole pine, limber pine, whitebark pine, Engelmann spruce, and alpine fir are most common) form an appropriate frame for the majestic Teton peaks and are reflected in the lakes which they encircle. The Interpretive Program The park museum is located at Jenny Lake, the focal point for all naturalist activities. In it are housed exhibits pertaining to history, geology, fauna, and flora of the Teton-Jackson Hole country. The collection devoted to mountaineering is in many respects unique. Adjacent to the museum is an open-air amphitheater, where campfire talks on geology, wildlife, and other subjects relating to the park are given every evening during the summer season. Nature walks, auto caravans, and all-day hikes are conducted by members of the naturalist division. An information desk is maintained at the museum, and rangers are there at all hours of the day to answer inquiries. These services are available during the summer season only, but information may be obtained at park headquarters throughout the year. The naturalists and rangers are always glad to assist visitors in making the most of their visit to the park. [Illustration: REVISED JANUARY 1951 N. P. G. T. 7021 GRAND TETON NATIONAL PARK, WYOMING] TRAIL DISTANCE MILES